148 Messrs. Maclean and Makita Goto on the 



Table II. 



Magnetizing 



force in 

 C.G.S. units. 



Temporary 



permeability in 



C.Gr.S. units of 



the unloaded 



wire at 12° 0. 



Ditto at 



76° C. 



Ditto at 

 167° C 



Ditto at 

 244° C. 



Ditto at 

 285° 0. 



2-84 



301 



306 



338 



353 



385 



3-70 



325 



340 



383 



385 



405 



4-83 



347 



366 



413 





461 



7-69 



478 



483 



548 





557 



10-40 



528 



573 



638 





675 



15-32 



522 









617 



XV. Electrification of Air by Water-Jet. By Magnus 

 Maclean, M.A., F.R.S.E., and Makita Goto {Japan)*. 



SIR WILLIAM THOMSON, experimenting in the rooms 

 of the Old College, Glasgow, found that electrified air 

 could pass through narrow passages, and he suggested to us 

 to try whether electrified air can pass through a metal tube 

 from one room to another. For this purpose a small room 

 adjoining the Natural Philosoplry Class-room of Glasgow 

 University was used. In this room a Thomson quadrant 

 electrometer, whose sensibility was 95 divisions of the scale, 

 per 1 volt difference of potential, and a spirit-lamp supported 

 on an insulating stand and connected to the electrometer, 

 were fitted up. Through, the handle-hole of the door sepa- 

 rating the small room from the class-room, a metal tube 

 60 centim. long and 1 centim. in diameter and connected 

 to a gas-pipe by a wire was passed. In the fireplace of the 

 small room a small fire was kept burning to produce draught 

 from the class-room to this room. The class-room was elec- 

 trified by a spirit-lamp connected to one of the conductors 

 of a large 24-plates electrical machine of Wimshurst type. 

 By this arrangement we could observe any variation of elec- 

 trification in the small room due to the passage of electricity 

 from the class-room to it. We believe electrified air passed 

 through the tube, but the effect was masked by the draughts 



* Communicated bv the Authors. 



